Steam-boiler



J. A. DOBLE.

STEAM BOILER.

APPLICATION FILED MAY 22, I9I8.

Patented Mar. 29, 1921.

INVENTOR.

Job A. fl- D0545 BY p WITNESS ll it it ti UNI TED STATES PATENT OFFICE.

JOHN A. DOBLE, OF SAN FRANCISCO CALIFORNIA, ASSIGNOIR TO DOIBLE LABORA-TORIES, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

STEAM-'IBOILER.

Specification of Letters Patent.

Patented Mar. 29, 1921 Application filed May 22, 1918. Serial No.235,950.

To all whom it may concern:

Be it known that I, JOHN A. Donna, a citizen of the United States, and aresident of the city and county of San Franclsco and State ofCalifornia, have invented a certain new and useful Steam-Boiler, ofwhich the followingis a s eeification.

My invention re ates to tubular steam boilers and more particularly tothat type commonly known as semi-flash boilers.

An object of the invention is to provlde a boiler of the charactermentioned in which the heat issuing from the burner enters the boiler atthe saturated steam zone and travels through the boiler in the opposited1rection to the water.

Another object of the invention is to provide a steam boiler of thecharacter mentioned which provides a large steam liberating surface.

A further object of the invention is to provide a steam boiler of thecharacter men tioned in which the hot gases are caused to travel in atortuous path around the tubes in the boiler.

The invention possesses other advanta geous features, some of which,with the foreoing, will be set forth at length in the lollowingdescription where I shall outline in full, that form of the inventionwhich I have selected for illustration in the drawings accompanying andforming part of the present specification. In said drawings I have shownone specific form of the boiler of my invention, but it is to beunderstood that I do not limit myself to such form, since the invention,as expressed in the claims may be embodied in a plurality of forms.

Referring to said drawin 'sz Figure l is a vertical section through theboiler of my invention.

Fig. 2 is a plan View of the water tanks.

Fig. 3 is a front elevation of the water tanks.

Fig. 4 is a cross section on an enlarged scale taken on the line 4% Fig.2.

The boiler oi my invention is of the series tube type, that is, a boilerhaving" a single "Water tube, bent into cnnvolutions, so that the watertravels in a long circuitous path through the boiler. The tube 3 isarranged in plurality of superposed liorinontal grids, the successiveconvolutions oil each grid lying" parallel. to each other and panlaterally with relation to eachother, so that the gases of combustionpass in circuitous paths downwardly tubes. The grids are connectedtogether in series, forming in eifect, a single tube.

Adjacent the upper end of the shell, the tube is connected to a seriesof superposed arc-shaped tanks 6 connected together in series andinclosing an open space which is the combustion chamber for the fuelmixture. Steam is liberated in these tanks and passes into thesuperheater tube 7 arranged above the tanks in one or more grids.Superheated steam is discharged from the boiler through the pipe 8.

The burner 9 is arranged to discharge a flame into the boiler at thesaturated steam zone or into the space surrounded by the saturated steamtanks 6, and the products of combustion pass downwardly through thegrids of Water containing tubes and are discharged through the vent 12at the bottom of the boiler. Water is introduced into the tube at thelower end and travels upwardly, in the opposite direction to theproducts of combustion, thereby insuring a maximum transfer of heat fromthe gases to the water. By introducing the fire at the saturated steamzone, the maximum amount of steam is liberated from: the hot water whichis heated as it ascends through the tube and this steam is superheatedin the tube 7 be fore it discharges from the boiler. This boiler isparticularly advantageous for steam automobiles, because the series tubearrangement and the introduction; of the fireat the saturated steamzone, causes the very rapid generation of steam from an all coldcondition, thereby permitting the automobile to he driven in a veryshort time after the fire is started.

Means are provided for keeping the tanltn it, partly filled with water,so that a large steam liberating surface is provided. These tanlrs arehorizontally disposed and are con-- through the grids of Y til it l. lll nected together in series so that the water flows from one tank tothe other. The adj acent ends of two successive tanks are connectedtogether by a block14 having a passage 15 therein, which opens upwardlyon the face of a shoulder extending into the tank. \Vater must rise inthe tank to the level of the shoulder before it passes to the tank nextabove and when it rises above this level it is discharged into the nextupper tank. This keeps the level of the water in the tanks atsubstantially the level of the shoulders.

The boiler includes three zones, the water heating zone, the steamliberating or saturated steam zone and the steam superheating zone. Thefire enters'the boiler from the blower burner at the saturated steamzone and passes downward through the water heating zone'in the oppositedirection to the water therein. The burner 9 is of the rotary type andproduces a mixture of liquid hydrocarbon fuel and air which is ignitedand blown into the saturated steam zone in the boiler.

In. the specification, I have described the tubular grids as beingformed of parallel tubes arranged parallel to the diameter of thecasing, but it is to be understood that the tube or tubes forming eachgrid may be disposed in any desirable manner either circumferentially,spirally or otherwise.

I claim:

1. In a boiler, a series of connected tubular grids arranged one abovethe other so that water passes upwardly through the grids successively,a series of tanks arranged above and connected to the series of gridsand inclosing a combustion chamber, superheater tubes connected to thetanks and disposed above the combustion chamber and means forintroducing a flame into the combustion chamber and directing the heatthereof downwardly through said grids.

2. In a boiler, a series ofconnected tubular grids arranged one abovethe other so that water passes upwardly through the grids successively,a series of connected horizontal arc-shaped tanks arranged above andconnected to said series of grids, means for maintaining said tankspartially filled with water, superheater tubes arranged above andconnected to said tanks, means for introducing a flame into the spaceinclosed by said tanks and an outlet for the products of combustion atthe bottom of the boiler.

3. In a boiler, a water tube through which water passes upwardly, aseries of tanks arranged above and connected to said water tube,superheater tubes connected to and arranged above the tanks, and meansfor introducing a flame into the boiler at the zone of the tanks.

4. A boiler comprising a casing, a series of connected horizontaltubular grids therein arranged. one above the other so that water passesupward through said grids successively, a series of connected tanksarranged above and connected to said grids, a horizontal tubular gridarranged above and connected to the upper of said series of tanks, andmeans for introducing a flame into the space inclosed by the tanks.

In testimony whereof, I have hereunto set my hand at San Francisco,California, this 16th day of May, 1918.

JOHN A. DOBLE.

In presence of H. G. PRosT.

